Originally Posted by Morelis
That would seem to conflict directly with the information here though that information is using old data, was this something that changed at the point the glancing rate was reduced? Just so I'm clear, you're saying that increasing hit has no bearing on the crit cap for white attacks?
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No, I'm saying that increasing that the statement "white attacks converted from misses to hits by hit rating can't crit" is the standard assumption. Normally, this is true. If you have 30% crit and 9% hit from talents and add 1% hit from rating, you will
not gain any additional crits. This assumption has implicitly been made in every set of AEP valuations we've discussed, ranging from Disquette's original work to the numbers most people get from Yo's today.
This will only be false if you are crit capped. According to the article linked by Yo, the crit cap is 50.2%, before adding any hit rating. (Recall that glancing blows were dropped from occurring 40% of the time to ~20%.)
If you're properly specced you'll have at least 6% hit and probably 9% hit before any gear. So you're looking at 56%-59% crit cap before any gear. With Kings, LoTP, GoA, and double Mongoose rolling I'm just barely breaking 50% crit. Thus, "white attacks converted from misses to hit by hit rating can't crit". I would expect this to hold true, at least at the margin, for any shaman whose Armory profile you link me.
Edit:
Apparently, Lujaar was trying to argue that hit rating cannot increase the crit cap. The evidence I have seen suggests that this is incorrect (and the rest of this post makes the opposite assumption in calculating the crit cap). Morelis was right in correcting him.
I misunderstood what was being debated, and I took this to be another instance of "you need to hit to crit," which is a commonly held misconception we are confronted with weekly in this thread. Since the 2.1 glancing blows reduction, the crit cap has been a complete non-issue for enhancement shamans, and I haven't seen a post on it in months. I will leave both of my posts as-is in the hopes that we'll get one less "hit to crit" post.
To conclude:
* White melee attacks are resolved by a one-roll system in which your "paperdoll" critical strike percentage will occur as a percent of all swings, not of all hits.
* A theoretical "crit cap" does exist, but it is very high (52% using the numbers Lujaar gives for glancing blows, DW miss chance, dodge, and assuming 9% from talents).
* This crit cap increases as hit rating and expertise rating are obtained on gear. In practice, enhancement shamans will never reach this crit cap.